Shower control knob



FIG. 1 is a front view of a shower control knob showing our new design;

FIG. 2 is a side view thereof, with the opposite side being a mirror image;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a rear view thereof. 

The ornamental design for a shower control knob, as shown and described. 